To determine the part of speech of "what",we have to know the types of parts of speech.There are eight types of parts of speech. These are noun,pronoun,verb,adverb,preposition, conjunction and interjection.Remember that determiners are a special type of adjective. To find out the part of speech of "what",we need to remember that a single word in different sentences can functions as different parts of speech. Now analyse the following example: ●You want a book. ●What do you want? Explanation:In the above sentence, the part of speech of "what" is a pronoun.Here "you" is a subject ,want is a verb, and "what" is the object of the verb "want."What" has replace the noun "book".So,here"what" is a pronoun. Now consider the following example: ●What time are they leaving? Explanation:Here"what" has been used as a determiner.Remember that a determiner is a special kind of adjectives.An adjective can m...